Grain-drill tooth.



G. 8: M. SMITH. GRAIN DRILL TOOTH. APPLICATION TILED 12.2, 190s.

Pate ted Jan. 5, 1909.

Fxc 3.

I Fla- L- Inventors Attb rn eys GORDON SMITH AND MAYNARD SMITH, OFWEYBURN, SASKATCHEWAN, CANADA.

' GRAIN-DRILL TOOTH.

Specification of Letters Patent.

Patented .Tan. 5, 1909.

Application filed April 2, 1908. Serial No. 424,820.

To all whom it may concern:

Be it known that we, GORDON SMITH and MAYNARD SMITH, subjects of theKing of Great Britain, residing at Weyburn, in the Province ofSaskatchewan, Canada, have invented certain new and useful Improvementsin Grain-Drill Teeth; and we do hereby declare that the following is afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

The present invention relates to grain drill teeth, and moreparticularly to that character of drill tooth used in planting cerealssuch as wheat and the like, wherein a plow or tooth precedes a funnel ordelivery tube, opening up a furrow into which the grain is deliveredfrom the funnel. The essential requirements of a drill tooth of thischaracter are, easy, light draft, nonclogging of the delivery opening,and, above all, equal adaptability to all characters of soil in which itmay be used. Many of the drills now in use are adapted for soft lightsoil only, and when applied to hard ground will not work. They cannot bekept in hard soil for any length of time, but are continually forced tothe surface and become useless. Many others cannot be successfully usedin damp ground. Their delivery openings do not bear the proper relativeposition to the point, and consequently when in damp ground the earthcrowds in behind the point and clogs the clelivery opening, thusrendering the tooth absolutely useless, and in many others the tooth isnot formed so as to readily out a furrow with the lightness of draftessential to a grain drill. The present drill tooth has been designedwith the sole idea of overcoming these objections and producing a drilltooth embodying all of the essentials to an easy working, effectivedrill toothi. e.adaptability to all soils, easy draft and non-cloggingof the delivery opening.

In order to clearly disclose the construction, operation and. use of thedrill tooth, reference should be had to the accompanying drawingsforming part of the present application, in which similar reference characters designate like parts in the several views.

In the drawings: Figure 1 is a side elevation of the tooth; Fig. 2 is acentral longitudinal sectional View of Fig. 1; Fig. 3 is inovablysecured to a frame.

a cross section on line 33 of Fig. 1; and, Fig. A is a cross section online 4-4: of Fig. 1.

In the preferred form of the device, the drill proper comprises a longforwardly and' downwardly curved tapered sharp point 1 The curvedportion is concaved in form, thus allowing the tip of the point to enterthe earth in advance of the curve. The curved portion leading from thepoint upward beyond the draft line is sharpened to constitute a cuttingedge cotiperating with the point in opening the furrow. The tooth isextended upwardly from the curve and provided with a notch adapted toreceive a pin by which the tooth may be re Side plates 2 are formedintegrally with the point, or may be welded or otherwise securedthereto, such plates extending rearwardly and acting to absolutelyprevent loose soil entering and clogging the delivery opening 3.

From this construction it will be seen that the lowest and most advancedportion of the delivery opening of the tooth is completely shielded fromloose earth on all sides. It is shielded in front by the downwardlyprojecting point 1, and on either side by the rearwardly projectingplates 2, so that it is practically impossible for the shoe to becomeclogged. The inclination of the point makes it possible to use the toothin soil of any character, whether hard or soft, wet or dry, light orheavy, and the concave curve of the edge leading rearwardly and upwardlyfrom the point gives an easy upward and forward drawing out to thetooth, thereby allowing the minimum of draft.

Clearly, many changes in the minor details of construction, in themanner of applying the tooth and its use may be resorted to, without inany way departing from the field and scope of the invention, and it ismeant to include all such in the invention as disclosed by the presentapplication illustrating the preferred form only of the tooth.

Having thus fully described our invention, what we claim as new, anddesire to secure by Letters Patent, is:

l. A drill tooth of the character described,

comprising a forwardly and downwardly terminating at the rear and abovethe tip of the penetrating tip of the point, whereby said point. 4

2. A drill tooth of the character described, comprising a forwardly anddownwardly inclined point terminating in a sharp penetrating tip andprovided with a conCaved cutting edge adapted to give an upward drawout, plates integrally formed with said point and extending rearwardlytherefrom, and a delivery passageway through said point opening at therear and above clogging of the delivery opening is prevented.

In wltness whereof we have hereunto set 15 our hands 1n the presence oftwo witnesses.

GORDON SMITH. MAYNARD SMITH.

Witnesses WM. J. BAXTER, M. J. PIERCE.

